To add an external document or link to a Microsoft Classroom assignment:

1. Go to your Classroom.
2. Find and open the class you want to add an assignment to.
3. Select the assignments tab.
4. Click the Create button in the upper-right corner.
5. Add an Assignment tile and related information.
6. Select the Add button in the Link section.
7. Paste or Enter the address of the external resource.
8. Click Add.